$\frac{{21}}{{30}} = \frac{{21:3}}{{30:3}} = \frac{7}{{10}} = 0,7$
$\frac{{62}}{{200}} = \frac{{62:2}}{{200:2}} = \frac{{31}}{{100}}$
$\frac{7}{4} = \frac{{7 \times 25}}{{4 \times 25}} = \frac{{175}}{{100}} = 1,75$
$\frac{5}{8} = \frac{{5 \times 125}}{{8 \times 125}} = \frac{{625}}{{1\,000}}.$
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